The four horsemen of SQL development: finger-cracking before joining those tables, neck-craning to decipher someone else's query, thigh-rubbing after sitting for 8 hours optimizing indexes, and the dreaded accidental CAPS LOCK when typing commands. Nothing says "I'm about to destroy this entire database" quite like accidentally typing DELETE FROM USERS instead of delete from users. The database doesn't care about your feelings, but it sure cares about your capitalization.